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D( x )
x-2 = 0
x-4 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:2) U (2:4) U (4:+oo)
6/(x-4) = 8/(x-2) // - 8/(x-2)
6/(x-4)-(8/(x-2)) = 0
6/(x-4)-8*(x-2)^-1 = 0
6/(x-4)-8/(x-2) = 0
(6*(x-2))/((x-4)*(x-2))+(-8*(x-4))/((x-4)*(x-2)) = 0
6*(x-2)-8*(x-4) = 0
20-2*x = 0
(20-2*x)/((x-4)*(x-2)) = 0
(20-2*x)/((x-4)*(x-2)) = 0 // * (x-4)*(x-2)
20-2*x = 0
20-2*x = 0 // - 20
-2*x = -20 // : -2
x = -20/(-2)
x = 10
x = 10
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